Your engine control unit (ECU/DME) is the learning type. It takes a few hours of driving for it to learn the air/fuel curves for your particular engine and driving style.
The car can also go into limp home mode for a number of reasons, but I think it limits RPM to 3000 in that situation.
-james
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'01 Boxster S, 51k miles
'05 Mazda 6 Grand Touring Wagon
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